Hoist



Aug. 17 1926.

J. H. SEITZ HOIST F le p 1925 2 Sheets-Sheet INVENTOR 13 ATTOR Y Fatented Aug. 17, 1926.

UNITED ST PATENT orrics.

JOHN H. snrrz; or NEW YORK, 71., 'ASSIGNOR or ONE-THIRD T NATHAN HIRSCH- .i-roaN AND ONE-THIRD 'ro EMIL KRIEGEBI, Born on EW YORK, N. Y.

Application filed $epternber 1, 1925. Serial No. 53,832.

The present invention relates to improvements in hoists, and more particularly to a construction of this type which is especially adapted for use in connection with the erection of buildings or other structures.

One of the objects of the invention is to provide a hoist, the frame of which is in the form of a tower made up of a plurality of sections, thereby permitting the height'thereof to be varied according to the requirements, that is to say according to the progress that is being made in erecting a building or I similar structure.

Another object of the invention is to provide a hoist of" the type mentioned having a bottom drive, that is to say wher'ein'" the mechanism for actuating the article-carr ers is disposed at the bottom of the supporting structure.

A further object of the invention is to provide the tower sections with guide sections for the article-carriers, the latter be ing made in the form of endless chain's;

With these and other objects in view,

" which will more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that many changes may be made in the size and pr'0 portion of the several parts and details of construction within the scope of the appended claims,.without departing from the spirit or sacrificing any of the advantages of the invention.

One of the many possible embodiment's'of the invention is illustrated in the accompanying drawings, in which:

Figure 1 is a front elevation of a ho st constructed in accordance with the present invention; Fig. 2 is a section taken on line 2-2 of Fig. 1, on a larger scale; Fig. 3 1s a front elevation of a detail showing thehoisting mechanism; Fig. 4 is aside elevation of the detail shown in Fig. 3; and Fig', 5 is a central vertical section taken through the lower portion of a tower sect-ion of the hoist frame.

In the drawings, the numeral indicates a supporting structure, in the form of a tower. This structure comprises abase 11, preferably made of wood, to which are attached four tubular standards 12, forming the bottom section of the tower. The body portion of the tower is made of a plurality of sections 13, each comprising four tubular standards 14 connected by braces and tiebars 15. Onto the uppermost tower section '13 fitted the top section 16 of the tower, including four tubular standards Each of the standards and 17 is provided at its lower end with a sleevelike extension 18', attached in any suitable manner thereto, the outer diameter of the said extension fitting elosely into the respective standard, to which t is attached, and also into the standard below the same. sections in proper positions, the tower top 16 1s provided with a plurality of hooks 19, to which are fastened the ends of cables 19, the lower ends of thelatter being wound upon drums 20. These drums are journaled ll'l bearings 21 on the base 11 and cooperate with cable tightenin devices 22 of any suitable construction. fn the case illustrated in the drawings, each drum shaft carries a ratchet wheel 23, with which is engaged a pawl 2 1, the latter being pivotally mounted upon the respective bearing 21. When the cables 19 are properly tightened, the respective pawls 24 prevent unwinding of the said cables from their drums.

Each tower section 13 has attached to it four channel irons 25, U-shaped in transverse cross-section, the said irons running parallel to the standards 14, so that, when the tower is assembled, the said channel irons form four guides for the article carriers 26. These carriers are in the form of two endless chains, operating in a manner hereinafter to be described.

The top section 16 carries two bearings 27, in which is ro-tatabl y mounted a shaft 28, to which are keyed or otherwise fastened two sprocket wheels 29. In alignment with these two wheels are mounted two sprocket wheels on the bottom section of the tower. The sprocket wheels 30 are keyed or otherwise fastened to a shaft 31, journaled" in bearings 32, the latter being slidably' arranged on vertical guides 33, mounted upon the base 11. Over the four sprocket wheels run the two articleecar'riers' 26, in the form of endless chains, as above stated, the said chains running throughthe guides 25 and being connected by, preferably, equi-dis tantly spaced bars 34', to which the containers to be hoisted are adapted to be attached;

In order to hold the tower These containers may be in the form of hods for carrying bricks, mortar and the like, but it is obvious that they may be of any other suitable configuration. The sprocket wheels 29 are bodilystationary on the top section 16 of the tower while the sprocket wheels 30 are slidable. In order to regulate the tension of the endless chains, any suitable means may be used. In the case illustrated, a sheave 36 is fixed to the shaft 31, and to this sheave is secured one end of a cable 37, the'other end of which is attached to a drum 38. This drum is mounted in bearings 39 on the base 11 of the supporting structure. To the shaft 40 of the drum 38 is fixed a ratchet wheel 41, with the teeth of which is adapted to mesh a pawl 42, the latter being pivotally mounted on the bearing 39.

The shaft 31 is actuated from a driving shaft 43, mounted in bearings 44 and provided with cranks 45. To the driving shaft is fixed a pulley 46, in alignment with apulley 47 on a shaft 48. Over these two -pul.eys runs a belt or cable 49. The shaft 48 is mounted in bearings, not shown, and has formed thereon a worm 50, in mesh with a worm gear 51, the latter being keyed or otherwise fixed to the shaft 31. It is obvious that, while herein a hand-drive has been shown and described, the shaft 31 may be actuated in any other suitable manner, such as by foot-power or by a motor. In any case, however, the chains 26 are driven adj acent the bottom of the tower, in contradistinction to hoists of this type heretofore in use, in which the sprocket gears on top of the tower are usually connected with the driving mechanism.

On the tower may be mounted one or more platforms 52, comprising each two brackets 53, which are attached to the standards 14 by pipe clamps 54, or otherwise. On these brackets are placed, outside of the tower, boards 55.

In setting up the tower, the base 11 and the elements fixed thereto are placed at the desired location, and thereafter as many tower sections 13 mounted thereon as necessary. The top section 16 is then put in place on the uppermost tower section 13, and the cables 19 set up and tightened by the aid of the tightening devices 22. The shafts 28 and 31 are then mounted in their respective bearings, and the chains 26 extended through the guides 25 and engaged with the sprocket wheels on said shafts. The cable 37, co-operating with the bearings 32 of the shaft 31, is then tightened for the purpose of tightening the chains 26. Thereafter the bearings 44 with the elements mounted thereon are put in position and the belt or cable 49 engaged with the pulleys 46 and 47. The platform is then mounted upon the tower, whereby the hoist is ready for operation. The hods are engaged with the article-carriers and are hoisted to the platform, where they are taken oii. The empty hods are then engaged with the article-carrier and brought down to the base to be removed from the article-carriers or filled while on said carriers. As the erection of the building progresses, the height of the tower is extended by mounting more sections 13 thereon.

The tower being made of a plurality of sections, may obviousiy be transported when not in use. The hoist may be erected and taken down even by unskilled labor, the elements thereof fitting one another.

What I claim is:

1. A hoisting-tower comprising a supporting structure, a horizontal shaft rotatably mounted adjacent the top of said structure, a horizontal shaft rotatably mounted adjacent the bottom of said structure, two sprocket wheels fixed to each of said shafts, the sprocket wheels of one shaft being in alignment with those on the other shaft, two endless chains running over said sprocket wheels, bars connecting said chains, and a driving mechanism associated with the shaft adjacent the bottom of said supporting structure.

2. A hoisting-tower comprising a supporting structure, a horizontal shaft rotatably mounted adjacent the top of said structure, a horizontal shaft rotatably mounted adjacent the bottom of said structure, two sprocket wheels ,fixed to each of said shafts, the sprocket wheels of one shaft being in alignment with those on the other shaft, two endless chains running over said sprocket wheels, bars connecting said chains, a worm gear fixed to the shaft adjacent the bottom of said supporting structure, a worm meshing with said worm gear, and a driving mechanism associated with said worm.

3. A hoisting-tower according to claim 1, comprising channel iron guides through which said chains travel in their movement.

4. A hoisting-tower according to claim 1, the bearings of the shaft adjacent the top of said structure being bodily stationary and the bearings of the shaft adjacent the bottom of said structure being vertically slidable, and means associated with said slidable bearings for tightening said chains.

5. A hoisting-tower comprising a bottom section, a plurality of body sections, and a top section, each of said sections comprising four tubular standards, and a sleeve fixed to the lower end of each standard of said body sections and top section and fitting insection, a plurality of body sections, and a top section, each of said sections comprising iour tubular standards, a sleeve fixed to the lower end of each standard of said body sections and top section and fitting into the upper end of the standard immediately below the same, vertical channel irons U- shaped in cross section on each of said tower body sections, the channel irons of each section being in alignment with those or" the other sections when the tower is set up, a horizontal shaft rotatably mounted on said bottom section, a horizontal shaft rotatably mounted on said top section, two sprocket wheels fixed to each of said shafts, the 15 extended through said U-shaped channel 20 irons.

Signed at New York, in the county of Bronx and State of New York, this 20 day of August, A. D. 1925.

JOHN H. SEITZ. 

